PHP Link Directory (phpLD) Fatal error: Cannot redeclare date_add() in /include/functions.php on line 2160

You are getting this error because function date_add() was introduced into newer versions of PHP. A quick fix is to replace date_add from include/functions.php with date_add2, there should be only 2 occurrences:

function date_add($timestamp, $months)

return date_add($start, $units * $mul);